Tool-holder.



F. A. JOHANSSON.

TOOL HOLDER.

APPLICATION FILED' JAN. :9, 191's.

9 I Inveno:

Attorney.

FREDBIK AMANDUS JOHANSSON, OF HEDEMORA, SWEDEN.

TOOL-HOLDER.

Specification of Letters Patent.

Patented Oct. 8, 1918.

Application filed January 19, 1918. Serial No. 212,780.

of the holder which otherwise is separated therefrom by a slit ending in a substantially cylindrical aperture.

In such tool holders the elasticity depends in part upon the nature of the material of which they are made, in part, upon the size and position of the aperture and the slit. Heretofore it has not been possible to Vary the elasticity of such holders without combining therewith a set of interchangeable parts and the prevailing practice is to use a number of holders 1 suitable for differenttools and works. This,

Copies of this patent may be obtained for however, involves increased expenses while the changes required result in a not inconsiderable loss of time. The present invention has for its object to remove this inconvenience by providing in a tool holder adjustable means whereby the elasticity of the1 tool receiving head may be varied at wil In the accompanying drawing a form of a holder according to the presentinvention is shown.

Figure 1 illustrates the holder in sideview, Fig. 2 from the upper side, while Figs. 3-5 show the pin in different positions in the aperture. Fig. 6 illustrates the pin in end-view and in side-view, partially in section, and Fig. 7 illustrates a holder for a lathe-steel while the holder in Figs. 16 is adapted for a thread-cutting tool.

In Figs. 12 and 7' 1 is the handle of the holder, 2 the elastic fore part or tool receiving head, which is provided with a fixing member 3 (Fig. 2) or 4 (Fig. 7 for the tool 5 (Figs. 1 andQ) or6 (Fig. 7). The elasticity ofthis part 2 is obtained by means of an aperture 7 and a slit 8 in the handle. Ac-

cording to the present invention there is,

journaled in the aperture 7 a pin 9, which on a part of its circumference is cut ofl, thus making part of the pin eccentric to the aperof difierent elasticity ture. By turning the pin 9, for instance by means of a tool inserted in the holes 11, the pin with its eccentric part 10 can be brought into different positions in relation to the slit 8. (See Figs. 3, 4 and 5.) It will be under stood that by moving the pin 9 from the position shown in Fig. 5 to that shown in Fig. 3 or any other adjustable position a portion of the yielding neck 12 whereby the head 2 isconnected with the body 1 will be rendered rigid and the elasticity of the holder will be varied accordingly.

This adjustment or turning of the pin can be effected after the fixing of the holder in its support and without necessitating the removal of the tool from the holder.

Having now particularly described the nature of my invention and the manner of its operation, what I claim is:

1. In an elastic tool holder the combination with a rigid body and an elastic tool receiving head yieldingly connected with said body and otherwise separated therefrom by a slit ending in a substantially cylindrical opening, of adjustable means in said opening for varying the elasticity of said tool receiving head.

2. In an elastic tool holder, the combination with a rigid body and an elastic tool receiving head connected therewith by a yielding neck but otherwise separated therefrom by a slit ending in a substantially cylindrical opening, of means engaging said opening for rendering rigid an adjustable portion of said neck.

3. In an elastic tool holder, the combination with a rigid body and an elastic tool receiving head connected therewith by a yielding neck but otherwise separated therefrom by a slit ending in a substantiallyeylindrical opening, of a pin rotatably mounted in said opening, said pin having a portion of its periphery cut away and so arranged that the elasticity of the tool receiving head may be varied by rotating said in in said opening.

In testimony whereo I have signed my name to this specification in the presence 0 two subscribing witnesses.

FREDRIK AMANDUS J OHANSSON.

Witnesses:

AXEL WOLRATH, CH. Z. JOHANSSON.

five cents each, by addressing the Gommissioner of Patents, Washington, D. G. 

